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                ## 第四節:HTMLAudioElement 接口 `HTMLAudioElement`接口代表了`<audio>`元素。 該接口繼承了`HTMLMediaElement`,但是沒有定義自己的屬性和方法。瀏覽器原生提供一個`Audio()`構造函數,返回的就是`HTMLAudioElement`實例。 ~~~ var song = new Audio([URLString]); ~~~ `Audio()`構造函數接受一個字符串作為參數,表示媒體文件的 URL。如果省略這個參數,可以稍后通過`src`屬性指定。 生成`HTMLAudioElement`實例以后,不用插入 DOM,可以直接用`play()`方法在背景播放。 ~~~ var a = new Audio(); if (a.canPlayType('audio/wav')) { a.src = 'soundeffect.wav'; a.play(); } ~~~
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